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Usami, who came off the bench to register his first Japan goal, will challenge the likes of Yoshinori Muto and Shinji Okazaki - set to be team-mates at Mainz next season - for a starting berth in Saitama on June 16.

European-based players such as Keisuke Honda, Shinji Kagawa and Yuto Nagatomo are included in a strong squad as Japan look to hit the ground running in a group that also includes Syria, Afghanistan and Cambodia.

Japan have a friendly against Iraq in Yokohama five days before the Singapore fixture.